Money taken out of my account but no confirmation email

I’ve tried about 4 times to order a the Uswitch exclusive sim which gives you 8gb for £10 and every time, I’ve got right to the end, typed in my bank details and then the website glitches and i’m back to my basket again. I checked my bank account to see if i’d been charged and it turns out I have, twice (although only 1p), the transactions both say pending but i’m worried that i’ve ordered 2 sims and that they’ll both arrive and i’ll have to pay 2 bills. I haven’t, however, recieved a confirmation email for either of the transactions so that makes me think that it hasn’t worked? I don’t want to try again in case I order another sim but I really need the sim card asap. Pls help!